Annual report [Section 13 and 15(d), not S-K Item 405]

Note 2 - Significant Accounting Policies (Details Textual)

v3.26.1
Note 2 - Significant Accounting Policies (Details Textual)
 12 Months Ended
Jan. 05, 2026
shares
Jan. 02, 2025
shares
Sep. 30, 2016
shares
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Number of Reportable Segments       1  
Stock Issued During Period, Shares, New Issues (in shares) | shares     250,000    
Preferred Stock, Dividend Rate, Percentage     2.50%    
Common Stock Dividends, Shares (in shares) | shares   101,935      
Common Stock Dividends, Shares, Percentage Of Fully Diluted Outstanding Equity   2.50%      
Research And Development Expense, Licenses Acquired | $       $ 0.1 $ 200,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | $       0 $ 0
Deemed Dividends | $       $ 8,800,000  
Number of Operating Segments       1  
Share-Based Payment Arrangement, Option [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)       3 years  
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)       10 years  
Subsequent Event [Member]          
Common Stock Dividends, Shares (in shares) | shares 111,209        
Common Stock Dividends, Shares, Percentage Of Fully Diluted Outstanding Equity 2.50%